Browsing by Author "Agote, Inigo"
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Item Binder Jetting Of Hardmetals: A Comparative Study Of Microstructures And Properties Of Different Commercial Powders(European Powder Metallurgy Association (EPMA), 2022) Azurmendi, Naiara; Lores, Asier; Agote, Inigo; Fernandes, Cristina; Figueiredo, Daniel; EXTREMATAdditive manufacturing of hardmetals is gaining attention, due to the possibility of fabricating complex shaped parts and new functional designs. Comparing to laser-based AM processes, binder jetting appears to be a more promising technology for hardmetals, due to its low-cost, fast manufacturing process that produces stress and crack-free parts with isotropic properties. In the present work, properties of two different plasma spherodized commercial powders (AMWC701 and AMWC702 grades) have been characterized and printed with binder jetting technology. In addition, final properties of the printed parts sintered in a Sinter-HIP furnace at two different temperatures (1455°C and 1480°C) have been evaluated. Density, shrinkages, microstructure and hardness have been analysed. Best results were obtained with AMWC702 grade sintered at 1455°C, where near full density was obtained (>99%). Measured Vickers hardness was 1227 HV30, which is coherent with the microstructural analysis and close to medium-grained commercial products.Item Ti-27Nb-8Mo beta alloy developed by electric resistance sintering(European Powder Metallurgy Association (EPMA), 2019) Gouvea, Eber; Lagos, Miguel; Vicente, Angel; Lopez, David; Agote, Inigo; Calero, A. Jose; Amigó, Vicente; EXTREMATECAS (Electric Current Assisted Sintering) brings together a family of consolidation methods that combine mechanical pressure and electric and thermal fields to improve the bond and densification of particles. Within the processes of pressure assisted sintering, the ERS (Electric Resistance Sintering) is characterised by a low energy input combined with high current density resulting in a very quick densification process. However, there is not much research about complex alloys developed through this technique. This work presents the development of a β-Ti alloy (Ti-27Nb-8Mo) densified by the ERS technique, evaluating the influence of time and current density on the microstructure and mechanical properties of the alloy. The microstructure has been characterized by XRD, SEM and EBSD. The elastic modulus, the flexural strength and the microhardness have been determined to evaluate the mechanical properties. The results indicate that higher current densities tend to melt the material in the center of the sample, producing a greater number of pores and micropores, and intermediate current densities have a better relation between densification, porosity and mechanical properties.